<span>At first glance, it seems that it would be more work to climb the staircase with the greater incline. But on further reflection, it is obvious that climbing the complete length of each staircase involves doing the same amount of work against gravity, because the vertical distance is the same. The answer is that each involves doing the same amount of work against gravity.</span>
Answer:
32.9166667 m / s^2
Explanation:
s = 4.25km (1000m / 1km)
= 4250m
u = 20m/s
delta T = 20min (60sec / 1min)
= 1200s
Use formula s = ut + (1/2)at^2
4250m = 20m/s * 1200s + (1/2)a*1200s^2
Rearrange it to find a
a = (s-ut) / (1/2 * t^2)
a = (4250m - 20m/s*1200s) / (1/2 * 1200s^2)
a = -32.9166667 m / s^2
Force=(mass*velocity)-(mass*velocity)/time
force=0-(-15*1400)/0.30
force=70000N
Answer:
Kristine is correct
Explanation:
this is because when an ice cube is placed into the warm water, it absorbs the heat from the water in order to melt which lowers the water's temperature.
in Eric's case, a hot cup of tea does not lose its heat because of cold hands. it varies depending on the cup whether it is a good insulator or not. also the heat can be lost through the air as well.
